Breast pain: Mirena (levonorgestrel) contains only a small amount of Progesterone so breast tenderness is not a side effect of this birth control. Common causes of breast tenderness include weight gain, hormonal fluctuations, caffeine intake, dietary and exercise changes, cysts, and others. If it continues schedule a visit for an examination. If you think you might be pregnant check then check a home pregnancy test.
Answered 2/6/2016
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